Module: PropertySets::ActiveRecordExtension::ClassMethods

Defined in:
lib/property_sets/active_record_extension.rb

Instance Method Summary collapse

Instance Method Details

#property_set(association, options = {}, &block) ⇒ Object 



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# File 'lib/property_sets/active_record_extension.rb', line 8

def property_set(association, options = {}, &block)
  unless include?(PropertySets::ActiveRecordExtension::InstanceMethods)
    self.send(:prepend, PropertySets::ActiveRecordExtension::InstanceMethods)
    cattr_accessor :property_set_index
    self.property_set_index = Set.new
  end

  raise "Invalid association name, letters only" unless association.to_s =~ /[a-z]+/
  exists = property_set_index.include?(association)

  self.property_set_index << association

  # eg AccountSetting - this IS idempotent
  property_class = PropertySets.ensure_property_set_class(
    association,
    options.delete(:owner_class_name) || self.name
  )

  # eg property :is_awesome
  property_class.instance_eval(&block) if block

  tb_name = options.delete :table_name
  property_class.table_name = tb_name if tb_name

  hash_opts = {
    :class_name => property_class.name,
    :autosave => true,
    :dependent => :destroy,
    :inverse_of => self.name.demodulize.underscore.to_sym,
  }.merge(options)

  # TODO: should check options are compatible? warn? raise?
  reflection = self.reflections[association.to_s] # => ActiveRecord::Reflection::HasManyReflection
  reflection.options.merge! options if reflection && !options.empty?

  unless exists then # makes has_many idempotent...
    has_many association, **hash_opts do
      # keep this damn block! -- creates association_module below
    end
  end

  # stolen/adapted from AR's collection_association.rb #define_extensions

  module_name = "#{association.to_s.camelize}AssociationExtension"
  association_module = self.const_get module_name

  association_module.module_eval do
    include PropertySets::ActiveRecordExtension::AssociationExtensions

    property_class.keys.each do |key|
      raise "Invalid property key #{key}" if self.respond_to?(key)

      # Reports the coerced truth value of the property
      define_method "#{key}?" do
        type  = property_class.type(key)
        value = lookup_value(type, key)
        ![ "false", "0", "", "off", "n" ].member?(value.to_s.downcase)
      end

      # Returns the value of the property
      define_method "#{key}" do
        type = property_class.type(key)
        lookup_value(type, key)
      end

      # Assigns a new value to the property
      define_method "#{key}=" do |value|
        instance = lookup(key)
        instance.value = PropertySets::Casting.write(property_class.type(key), value)
        instance.value
      end

      define_method "#{key}_record" do
        lookup(key)
      end
    end

    define_method :property_serialized? do |key|
      property_class.type(key) == :serialized
    end
  end
end